WIP: V6 rewrite

[constantoine]

• Unify error type
• Update CI V6 ci #78
• Split URL logic to its own file Move URL logic to its own file #79

[codecov]

Codecov Report

❌ Patch coverage is 93.19287% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.26%. Comparing base (2aa6384) to head (c87d21e).

Files with missing lines	Patch %	Lines
src/url.rs	90.55%	36 Missing ⚠️
src/lib.rs	86.95%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   95.15%   93.26%   -1.90%     
==========================================
  Files           5        6       +1     
  Lines        1301     1128     -173     
==========================================
- Hits         1238     1052     -186     
- Misses         63       76      +13     

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